The yellow triangle categorized "2" inside the diagram is any device you want to show off while the temperature receives too high. The installation guide makes use of an oil burner as an example of this kind of device. For your case you'll leave that transfer unwired, unless you want to rig up a solenoid valve to douse your timber fire. :). Also attached to the stove, there is a line in, a 3-conductor grounded line with a 3-prong plug at the cease - for 120v strength supply. There's additionally a blower at the range, which takes 120v electricity, and has 2 conductors - white and black. It forces the warmed air through the output duct. All of the wires are meet in a junction box, and none are connected.